二语交际课堂中语言隐性修复的应用

Since mistakes or errors is an issue of much concern for the teachers and second language acquisition experts implicit feedback and explicit feedback are often used .This study observed a lesson to fin...     

Why Is It Better to-Marry Egyptian Woman than Polish？——A Cross-cultural Perspective of Implicit and Explicit Gender Attitudes of Polish and Egyptian Women

Two series of experiments were conducted on Polish and Egyptian women. The differences in implicit and explicit attitudes towards men and women were examined using implicit and explicit measures of each. The explicit attitude was measured by rating male and female objects （family members, e.g. mother, husband, and son） on 5-point scale. A modified version of an Implicit Association Test （IAT - Greenwald, McGhee ＆ Schwartz, 1998） was used for measuring implicit gender attitudes. Two series of experiments were conducted. The first series consisted of 6 experiments. Three of them were conducted on female students of different departments of Gdafisk University （the samples of 45, 26 and 38 persons）. Married, unemployed women from small Polish villages took part in the following two experiments （the samples of 30 and 30 women）. The sixth experiment consisted of the participants of three-year personal development training. The second series of experiments consisted of 5 researches. Three of them were conducted on unemployed, married Egyptian women living in small villages. Female students of South Valley University took part in two other experiments. All experiments conducted on Polish samples demonstrate the presence of negative implicit attitude of women towards men and positive implicit attitude of women towards women. At the same time Polish women demonstrate a strongly positive explicit attitude towards both men and women. Experiments conducted on non-educated Egyptian women found neutral and positive implicit attitude towards men. Educated Egyptian women associate negative effect with the category of men. The experiments also demonstrated positive implicit attitude of Egyptian women towards own sex. Furthermore. positive conscious attitude emerged from explicit measures.     

Mathematical Description of Acousto-Optic Tunable Filter Orthogonal Polarizing Method

The foremost acousto-optic tunable filter(AOTF) was proposed in 1967[1], but the appliedAOTF based on TeO2crystal was not put into practiceuntil 1974, when the non-linear optical design meth-od[2]was proposed. In recent years, AOTF has beenapplied widely as optical splitting component. And ithas attracted more and more attention for its meritssuch as rapid scanning speed, wide tuning range ofspectrum and large aperture of angle of incidence.AOTF is often used for spectrum measurement te…     

Numerical investigation of penetration performance of non-ideal segmented-rod projectiles

The design of a segmented-rod projectile is often simplified into an ideal one in theoretical analysis for the convenience of modeling of its performance. But the actual performance of non-ideal segmented-rod projectiles over the impact velocity range in practical applications was rarely explored. AUTODYN numerical code is used to investigate the influence of the component design upon the penetration performance of non-ideal segmented-rod projectiles over a wide range of impact velocities, which can be used to guide the optimal design of weaponry segmented-rod projectiles.     

An Analysis of the Relationship between Implicit and Explicit Knowledge——the Grammar Study

The discussions about cognition psychology in the field of second language acquisition(SLA) exert great influence on language teaching practice and theoretical research.Interface positions on the role of explicit and implicit knowledge in SLA have led to further exploration by different researchers.This paper,on the basis of previous studies,makes a brief review of the relation ship between implicit and explicit knowledge,focusing on the analysis of interface position and its role in grammar teaching and learning.     

Testing Speaking Skill with Help of Language Lab or Computer

Speaking skill is an important component in the student＇s communicative competence. The testing of this skill is indispensable with its functions of providing useful feedback and motivating students. Where direct face-to-face oral test is impossible when large number of candidates involved, language lab or computer can be used to carry out various testing tasks in the evaluation of the students＇ oral communicative competence.     

Optimization of Power Dissipation in Pipelined Analog-to-Digital Converter

Power optimization for pipelined analog-to-digital converter(ADC) was studied. Operational principle of pipelined ADC was discussed and noise voltage caused by two important thermal noise sources, sampling switch and amplifier, was quantitatively analyzed. Method used to minimize power and the values under simple model were presented. Power can be saved by making the sampling and feedback capacitors scale down in the pipeline. And the size of capacitors was limited by thermal noise in high resolution ADC. The equivalent circuits of the two important thermal noise sources were established. Thermal noise was optimally distributed among the pipeline stages, and the relationship between scaling factor and closed loop gain was obtained for minimum power dissipation. Typical closed loop gain was 2 or 4 in pipeline ADC, and the corresponding scaling factor was 1.217 and 1.317. These results can serve as useful guidelines for designers to minimize the ADC‘s power consumption.     

箭和鹰

正[英语原文]An eagle was flying in the sky. As soon as it saw a rabbit, it swooped down on its prey.Suddenly it was hit by an arrow.It fluttered slowly down to the earth, and blood was pouring from the wound.When the eagle looked down, it found that the shaft of the arrow was feathered with one of its own plumes."Alas!"it cried,"We often give our enemies the means for our own destruction."     

Technological feasibility of biodiesel production from bioaugmented hydrolysate of waste sludge in a municipal wastewater treatment plant

The hydrolysate of waste sludge was used as the feedstock of biodiesel production, and its technological feasibility was investigated. Waste sludge, collected from No.3 Municipal Wastewater Treatment Plant of Xi＇an, was hydrolyzed in two parallel reactors firstly. Yeast was added into one reactor for bioaugmentation, and the other reactor without yeast was used as a control. Then an acid-catalyzed in situ esterification process was carried out to convert the hydrolysate to biodiesel. The results of hydrolysis showed that the reactor bioaugmented with yeast could promote hydrolysis compared with the control one because of an obvious variance in total suspended solid （TSS）, volatile suspended solid （VSS） and soluble chemical oxygen demand （SCOD）. Furthermore, gas chromatography （GC） analysis exhibited that the total volatile fatty acid （VFA） was low in the hydrolysate of bioaugmentation reactor; however, its yield of the fatty acid methyl esters （FAMEs） by in situ esterification was obviously higher when compared with the control one. Therefore, it may be inferred that the hydrolysate of bioaugmentation was mainly inclined to longer-chain fatty acid rather than to VFA. Anyway, an FAMEs yield of 9.24% （wt%） from dried sludge was attained after the 12-d bioaugmentation hydrolysis and succedent esterification. This value was not only higher than that of the control one but also higher than that reported in previous literature. The above results illuminated that it was feasible to produce biodiesel from the bioaugmented hydrolysate of waste sludge.     

VCA Direct-Drive High Speed and Precision XY Table

In order to compensate for the limitation of conventional XY table used in semiconductor integrated circuits(IC) packaging and improve its speed and accuracy, a voice coil actuator (VCA) direct-drive high-speed and precision positioning XY table used in wire bonder was proposed. Also, a novel flexible decoupling mechanism was used in the positioning table, and the small moving mass enabled the positioning table to move at high speed and precision. XY table deformation interference caused by assembly error and instant interference generated by dynamic load moving with high speed and acceleration can be eliminated through the flexible decoupling mechanism. Considering the positioning table as lumped mass spring system,the dynamic equations of the mechanical system and the VCA were built according to the Newton mechanics principle and electromagnetic theory. Then the electromechanical coupling control model of the system was created through Laplace transform. Based on displacement PID controller, the loop-locked controlling algorithm of the positioning system was investigated. The dynamic control algorithm effectively improved the system dynamic performance. The precision test of the prototype machine was carried out, and the results validated the correctness of the model and the theory. Compared with traditional XY table, the table has higher speed, acceleration and positioning accuracy.     

Research on the overload protection reliability of moulded case circuit-breakers and its test device

This paper analyzed the reliability and put forward the reliability index of overload protection for moulded case circuit breaker. The success rate was adopted as its reliability index of overload protection. Based on the reliability index and the reli- ability level, the reliability examination plan was analyzed and a test device for the overload protection of moulded case cir- cuit-breaker was developed. In the reliability test of overload protection, two power sources were used, which reduced the time of conversion and regulation between two different test currents in the overload protection test, which made the characteristic test more accurate. The test device was designed on the base of a Windows system, which made its operation simple and friendly.     

Quantitative evaluation of air pollution in transport strategic environmental assessment: a case study based on uncertainty analysis and graphic information system technology

Although the impact of road transport on urban air quality has achieved a high profile in China, still greater attention is required as it has not yet been considered fully even in relation to the road network linking cities and urban areas. Strategic environmental assessment （SEA） is a systematic and comprehensive process for evaluating the environmental impacts of a policy, plan or program in publicly accountable decision-making. Air pollution has been recognized as a significant issue in most transport SEA practices. The Strategic Environmental Assessment of the Hubei Road Network Plan （2002-2020） （HRNP） was introduced as one of the World Bank＇s pilot SEA projects. An effective framework was developed to investigate the functional relationship between the road network and its potential air pollutant emissions. In this study, two indicators were identified： emission intensity/ inventory of pollutants and the spatial distribution of the most polluted areas. Because strategic actions are inherently nebulous and data quality is often disappointing, three alternative scenarios were employed to address uncertainties and data/scale issues. Calculations were made using emission models and results were analyzed with the help of statistical tools and the geographic information system （GIS）. The results from the project implementation and the feedback from the World Bank have both shown that the proposed framework is effective in the transport SEA process.     

Applications of airtight concrete grouting to road tunnels

Road tunnel excavation often traverses coal strata,which is at risk of firedamp explosion that usually results in disaster.Airtight concrete grouting is popularly used in this kind of tunnel project,Based on the essential theory of mechanics of fluids in prous media,the principle of improving concrete airtight property and its influential factors are investigated.The proportioning tests and monitoring method for airtight concrete are introduced,which is illustrated by a case study applied to the project of the Huayinshan Tunnel.It is proved by engineering practices that the achievement of this research work is beneficial to tunneling project across coal strata.     

Preparation of SO4^2-/TiO2-La2O3 solid superacid and its catalytic activities in acetalation and ketalation

SO4^2- / TiO2-La2O3, a novel solid superacid, was prepared and its catalytic activities at different synthetic conditions are discussed with esterification of n-butanoic acid and n-butyl alcohol as probing reaction. The optimum conditions have also been found, mole ratio of n（La^3＋）：n（Ti^4＋） is 1：34, the soaked consistency of H2SO4 is 0.8 tool/L, the soaked time of HESO4 is 24 h, the calcining temperature is 480 ℃, the calcining time is 3 h. Then it was applied in the catalytic synthesis often important ketals and acetals as catalyst and revealed high catalytic activity. Under these conditions on which the molar ratio of aldehyde/ketone to glycol is l： 1.5, the mass ratio of the catalyst used in the reactants is 0.5%, and the reaction time is 1.0 h, the yields of ketals and acetals can reach 41.4%-95.8%.     

An implicit symmetry constraint of the modified Korteweg-de Vries （mKdV） equation

In this paper, an implicit symmetry constraint is calculated and its associated binary nonlinearization of the Lax pairs and the adjoint Lax pairs is carried out for the modified Korteweg-de Vries （mKdV） equation. After introducing two new independent variables, we find that under the implicit symmetry constraint, the spatial part and the temporal part of the mKdV equation are decomposed into two finite-dimensional systems. Furthermore we prove that the obtained finite-dimensional systems are Hamiltonian systems and completely integrable in the Liouville sense.     

Interactive Techniques Used in Teachers’ Oral Feedback and Its Impact on Students’ Participation

English language teaching is facing a reformation with the emphasis of students-centered learning approach and communicative language learning. Classroom interaction becomes popular especially during teachers’ oral feedback. In order to involve more students to participate, interactive techniques are applied in the classroom such as elicitation and recasts. This essay will focus on the adoption of interactive techniques in teachers’ oral feedback in terms of a specific grammar lesson and try to explore its impact on students’ participation.     

Graft Copolymerization of Ethyl Acrylate onto Hydroxypropyl Methylcellulose Using Potassium Persulfate as Initiator

Cellulose is one of the mostabundantnatural pol-ymers that have received much attention in research tomodify its physical and chemical structures to improveits properties and broaden its applications. A lot ofwork[1—5]has been reported on the modification viagraft copolymerization of vinyl monomers onto cellu-lose, often using different initiator systems. Variousvinyl monomers such as methyl methacrylate[6,7], 4-vinylpyridine[8], acrylonitrile[9,10], and styrene[11]have been used for cellulos…     

Compensation of dead-time effect of speed sensorless vector control system

The key of speed sensorless vector control system lies in the accurate orientation of magnetic field. In some field-oriented algorithms, the integrator of observers and the dead-time effect bring in system errors during the estimation of field position. In this paper, a saturated feedback integrator is used, and the dead-time effect is compen-sated by current positive feedback. Experiments were carried out on the hardware platform of MCK2407, with chip TMS320LF2407 from TI Company. The results show that the proposed method is simple and effective, and the accuracy of field position is improved.     

READINGS

The computer is the most important invention since the type of engine was used in cars. Today it is the greatest effect on science, industry and business,but it’s being used more and more in education and medicine. It has touched the lives of everyone. It’s a revolutionary invention. The oldest kind of computer is the abacus (算盘),used in China since the sixth century. In the seventeenth century an adding machine was invented,but the first large modern computer was built in 1937.